Answer:

Years ago, we used to haul our weanlings to shows with their heads tied, and when we arrived, the baby was stressed out and sick. When a weanling arrives at a show stressed, he’s not going to show as well, and he can become sick and die. Hauling tied is enough stress on grown horses. Babies don’t need it.

If your trailer doesn’t have specific compartments, see whether you can remove some dividers to give your weanling more room.

The next thing we do is attach a big piece of plywood across the rubber mat at the lower edge of the divider so that the weanling won’t slide through. If they lay down and get their legs under the rubber mat, they can end up in the next stall. We get the wood at the lumber yard, cut to the width of the trailer, and then we trim it at home if we need to.